But these are all issues that a well-established P2P Car Service could handle. Require drivers to submit a current copy of their license, insurance claim history and registration for the car in question every 3-6 months. Make this information available on the website (except driver's lastname and address or whatever for privacy). Put a GPS logger in each car (if it's not on, you don't get paid). Charge exclusively on a point-to-point basis (e.g. let the driver carry the risk of going in circles).